OWA 2010 dosent work properly from external world

We have implemented exchange 2010 and OWA for our users and when any user logs within our LAN network into owa it works absolutely fine. I can browse all the folders for sent items deleted items and mail preview. It comes up very fast.
But if access the OWA from external world it opens and click the sent items or browse any folders nothing happens and if i go to new send a new email and type in a user name and say check names nothing happens.Is it any thing to do with the configuration, or is our firewall blocking something.

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